Concrete form anchor and tie



Feb. 6, 1968 H. J. HOLT 3,367,620

CONCRETE FORM ANCHOR AND TIE Filed March 29, 1965 2 Sheets-Sheet 1 Fig? 5. Henry Jack HOII- INVENTOR.

Feb. 6, 1968 H. J.IHOLT 3,367,620

CONCRETE FORM ANCHOR AND TIE Filed March 29, 1965 2 Sheets-Sheet 2 a 4 w 62 I 6 a} f/ 74 67 47 82 72 W ,1 & H" 1 4 60 1 .1 1 m mung mum? jjiiilj. f; wa 1' K5" 15 78 M 5- 54 un H |m||||| I Il|lIl|l|l mum 58 70 lllmlli rmw :21. V ""ilmmn I Hinr dackHol-l" F1 9110. I H INVENTOR.

United States Patent Ofiice Filed Mar. 29, 1965, Ser. No. 443,290 1 Claim. (Cl. 249-213) ABSTRACT OF THE DISCLOSURE A pair of axially aligned rod sections are secured together releasably by segmental rotary threads or wedge blocks upon relative rotation of the sections through a fraction of a turn. When secured together the adjacent ends of the rod sections abut each other to securely engage the threads or blocks and form a unitary rod. At least one rod section is dimensioned to pass through a concrete form, and the outer end of said rod section is provided with a form clamp to abut the outer side of the form. In one embodiment, one rod section terminates within the form and is provided with a hair pin anchor adapted to be embedded in concrete filled into the form.

This invention relates to concrete form clamps for use particularly in the construction of massive concrete structures.

It is the general object of the present invention to provide a concrete formanchor and tie assembly overcoming the disadvantages inherent in the conventional tie rodend bolt combinations and characterized by the following attributes:

(1) Easily adaptable for use either as a form anchor or as a form tie.

(2) Rapidly assembled and disassembled in form makeup and stripping.

(3) Leaves nothing in the concrete after stripping, when used as a tie, and hence eliminates the possibility of rust staining of the finished concrete.

(4) Provides an assembly of great strength and hence has a high safety factor for use in heavy construction.

(5) Accommodates forms of various sizes and widths.

(6) Enables construction of a form which does not leak.

(7) Operates as a single unit, parts of which cannot get lost during the form work.

(8) Adaptable for use with forms of various types and designs.

I (9) Makes possible the use of fewer ties in a given form area and hence leaves fewer holes to patch.

(10) Provides positive and easy connection and disconnection. 7 v

(11) Eliminates the necessity for welding the tie parts.

(12) Is of simple inexpensive construction and incorporates a minimum number of parts.

form support sections, eachpenetr'ating and supporting one of the forms and maintaining it in spaced relation to the other.

In either application, both sections are provided on their inner ends with rotary interengaging means for releasably securing the sections in substantial axial alignment, with their inner ends abutting each other.

Patented Feb. 6, 1968 Form clamp means are provided on the outer ends of those sections which project outside the concrete form for releasably maintaining the form in position. The assembly thus may be applied to conventional forms, a simple twist suflicing to connect or disconnect the sections relative to each other during construction and stripping of the forms.

Considering the foregoing in greater detail and with particular reference to the drawings, wherein:

FIG. 1 is a vertical transverse section of a concrete structure showing part of a single concrete form and one of the assemblies of the invention in its form anchor application;

FIGS. 2 and 3 are views in side elevation of the anchor in its coupled and uncoupled positions, FIG. 3 being at 90 to FIG. 2;

FIGS. 4 and 5 are enlarged fragmentary views of the anchor assembly, FIG. 5 being at 90 to FIG. 4, illustrating the coupling means employed for releasably coupling together the two sections of the anchor;

FIG. 6 is a vertical transverse section of a concrete structure showing part of a double concrete form and one of the herein described assemblies used in its form tie application;

FIGS. 7 and 8 are views in side elevation of the tie in its coupled and uncoupled positions, FIG. 8 being at 90 to FIG. 7; and

FIGS. 9 and 10 are enlarged fragmentary views, FIG. 10 being at 90 to FIG. 9, illustrating the means of releasably interengaging the two sections of the tie.

In its form anchor application, illustrated in FIGS. 1-5, the assembly of the invention is applied as an anchor during the pouring in successive lifts of a massive concrete structure 20. Widely separated forms, one of which is indicated generally at 22, confine the concrete. The forms may be variously constructed, but in the illustrated form of the invention comprise form sheathing 24, backed by studs 26 and double walers 28.

The form demountably is secured in position by means of a form anchor assembly indicated generally at 30. This assembly basically comprises a rod formed in two sections, 32 and 34.

Section 32 is an anchor section which remains embedded in the concrete. A hairpin anchor rod 36 or other suitable type of anchor member is attached to its inner end.

Section 34 is a form support section. It may be of uniform cross section along its entire length or may be provided with an enlarged tapered segment 38 at its inner end. This segment may have an exterior taper calculated to facilitate its removal from the hardened concrete.

The outer end of section 34 is provided with clamp means for exerting clamping pressure against the form. For this purpose there is provided on the outer end of section 34 a threaded segment 40 which mounts a clamp plate 42 and a nut 44. A flat take-off lug 46 is fixed to v the extreme end of the outer end of the threaded section.

A particular feature of the invention is the provision of rotary interengaging means for making possible the coupling and uncoupling of the two sections with remarkable ease and rapidity. The construction of the rotary interengaging means is shown particularly in FIGS. 4 and 5.

The outer end of section 32 is provided with an axial socket 48 in which are located axially arranged segmental threads 50. The inner end of section 34 is provided with a tongue 52 dimensioned for reception in socket 48. Segmental threads 54, axially arranged, are present on the tongue section and match segmental threads 50 in socket 48.

The arrangement of the threads is such that when the threads are engaged, the ends of sections 32 and 34 will be drawn tightly into abutment with each other. Accordingly there is provided a bayonet type joint by means of which the two sections may be coupled rapidly, merely by inserting tongue 52 into socket 48 and giving the two sections a fractional turn relative to each other, drawing together the abutting end surfaces of sections 32, 34. The sections then may be uncoupled merely by giving them a relative twist in the opposite direction.

Coupling and uncoupling are facilitated by noting the position of flat take-off lug 46, which may be arranged in such a manner that when it is vertical, as in FIG. 2, the threads are engaged, and when it is horizontal, as in FIG. 3, the threads are disengaged.

In the form tie application of the invention, illustrated in FIGS. 6-10, the assembly of the invention is employed as a tie in the construction of a concrete structure 60 to be poured in successive vertical lifts. Two spaced forms are employed. Each is indicated generally at 62. The form construction may be varied, but in the illustrated embodiment comprises sheathing 64, vertical studs 66, and double walers 67.

In this embodiment the ties are formed in two sections, indicated generally at 68, 70, which may be tapered longitudinally to facilitate their removal from the hardened concrete. The outer end of section 68 is provided with a threaded segment 72 which mounts an apertured form clamp 74, a clamping nut 76, and a flat take-01f lug 78.

Similarly the outer end of section 70 is provided with a threaded segment 80 which mounts an apertured clamp plate 82, a clamp nut 84, and a take-off lug 86.

The two sections are releasably interengaged in substantial axial alignment by rotary interengaging means, the construction of which is shown in detail in FIGS. 9 and 10.

The inner end of section 68 of the form tie assembly is formed with an axial socket 90 having radially extending, circumferentially and axially spaced wedge blocks 92, having bevelled wedging ends 93.

The inner end of section 70 is provided with an axially extending tongue 94 dimensioned for reception in socket 90 of section 68. Tongue 94 carries radially extending, axially and circumferentially spaced wedge blocks 96 having bevelled wedging ends 97. Wedge blocks 92 and wedge blocks 96 are dimensioned for cooperative wedging engagement with each other. Accordingly the two sections may be coupled together rapidly and easily, simply by inserting tongue 94 in socket 90 and twisting it one-quarter turn until the two meeting end surfaces of the sections are drawn tightly into abutment with each other, as indicated by the vertical or horizontal position of fiat heads 78, 86.

In this connection, it will be understood that segmental threads 50, 54 and wedge blocks 92, 96 are interchangeable in their application to the forms of the invention described and shown herein.

In the form anchor application of the invention illustrated in FIGS. 1-5, the anchor assembly is placed in the form in the manner illustrated in FIG. 1, with lug 46 preferably in the upright position. Clamp nuts 44 then are tightened down, the concrete poured and allowed to harden. During the hardening process segment 38 of section 34, which is embedded in the concrete, may be loosened by rotating section 34 with a wrench applied to lug 46.

When the forms are to be stripped, section 34 may be rotated until lug 46 has moved from the vertical position of FIG. 2 to the horizontal position of FIG. 3. When this occurs, the segmental threads 54 of tongue 52 will be removed from segmental threads 50 of socket 48 and section 34 of the assembly may be withdrawn. This leaves anchor section 32 and attached anchor rod 36 embedded into the hardened concrete ready for use when the forms are shifted vertically to a new position, ready for the next pour.

In the form tie application illustrated in FIGS. 6-10 the procedure is similar, with the exception that the form tie assembly including sections 68, extends entirely through a pair of spaced vertically arranged forms 62 and are removed completely from the concrete during the stripping operation.

In both of the applications of the invention, the openings left after the forms have been stripped are plugged with concrete in the usual manner.

Thus it will be apparent that by the present invention, I have provided a concrete form anchor and tie assembly which is versatile in that with but a minor modification it may be used with equal effectiveness to both cantilever and straight-through form construction. This use is characterized by remarkable quick makeup and stripping of the forms, since tedious threading of threaded parts is eliminated and all that is required is a quarter turn of the two sections of the assembly relative to each other in order to couple and uncouple them. Furthermore, the assembly provides a simple, rugged inexpensive, product of great strength.

It is to be understood that the form of my invention herein shown and described is to be taken as a preferred example of the same and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claim.

Having thus described my invention, I claim:

1. A concrete form anchor and tie, comprising (a) a pair of rod sections arranged in axial alignment and having adjacent transverse end surfaces disposed for mutual abutment,

(b) segmental rotary interengaging means integral with and formed on the adjacent ends of the rod sections for releasably securing the sections together upon relative rotation of the sections through a fraction of a turn,

(c) the adjacent transverse end surfaces of the sections abutting each other when the sections are secured together, whereby to form a unitary rod,

(d) one rod section being dimensioned to pass outward partially through a concrete form, and

(e) form clamp means on the outer end of said one rod section that is dimensioned to pass through the form,

(f) the other rod section being dimensioned to terminate within a concrete form, and

(g) hairpin means secured to the inner end of said other rod section.

References Cited UNITED STATES PATENTS 676,785 6/1901 Toelpe 249 X 1,078,007 11/1913 Strange 249213 X 2,046,674 7/1936 Coates 24942 2,164,592 7/1939 Pilj 249213 X 2,554,415 5/1951 McGregor 52-699 X 2,673,751 3/1954 Finch 285-391 X 2,823,441 2/1958 Williams 249190 3,275,354 9/1966 Sutlifii' et al 285-391 X J. SPENCER OVERHOLSER, Primary Examiner. WILLIAM J. STEPHENSON, Examiner. 

